This is a powerbox pro with 6.40

routerboard: yes
model: 960PGS
serial-number: 75A0078C1D4C
firmware-type: qca9550L
factory-firmware: 3.34
current-firmware: 3.34
upgrade-firmware: 3.34

Only connected cable is at port1. All ports poe=auto-detect:

00:10:11 poe-out,warning ether4 detected poe-out status: short_circuit
00:10:13 poe-out,info ether4 detected poe-out status: wait_for_load
00:10:14 poe-out,warning ether4 detected poe-out status: short_circuit
00:10:14 poe-out,info ether4 detected poe-out status: wait_for_load
00:10:15 poe-out,warning ether4 detected poe-out status: short_circuit
00:10:16 poe-out,info ether4 detected poe-out status: wait_for_load
00:10:18 poe-out,warning ether4 detected poe-out status: short_circuit
00:10:18 poe-out,info ether4 detected poe-out status: wait_for_load
00:10:19 poe-out,warning ether4 detected poe-out status: short_circuit
00:10:19 poe-out,info ether4 detected poe-out status: wait_for_load
00:10:20 poe-out,warning ether4 detected poe-out status: short_circuit
00:10:20 poe-out,info ether4 detected poe-out status: wait_for_load
00:10:21 poe-out,warning ether4 detected poe-out status: short_circuit
00:10:22 poe-out,info ether4 detected poe-out status: wait_for_load
00:10:22 poe-out,warning ether4 detected poe-out status: short_circuit

What is the length of the supply cable POE-IN ?
I had such a problem with the power cable with its length more than 15m.
I had to enable the function - ether1-poe-in-long-cable=yes

What is the length of the supply cable POE-IN ?
I had such a problem with the power cable with its length more than 15m.
I had to enable the function - ether1-poe-in-long-cable=yes

Direct connected with 24V. There is nothing attached wich needs poe. When I attach a MT board to this port it gets powered and the error goes away.

Exactly the same problem I have on 960PGS. RoS 6.40.1.
I returned to version 6.39.2 and everything is fine.

Same with 6.40.3 return to bugfix only 6.38.7 and it's ok now

The command is not anymore available at the new device.
Or the cable is short or the device is connected in interface is doesn't need power.

Exactly the same problem I have on 960PGS. RoS 6.40.1.
I returned to version 6.39.2 and everything is fine.

Same problem here. Do you know if there is any plan for fix it in next 6.40.X or should I go back to 6.39.X ?

I just had this happen on port 3, with nothing connected, in 6.40.5. Updating to 6.41rc56 solved it.

I'm also having this issue on a Hex PoE (RB960PGS) with the latest bugfix firmware (6.40.8).

From a quick investigation it seems to only happen for me on the port with the lowest PoE priority (highest priority number). I managed to "fix" it for now by setting the PoE on a spare ethernet port to forced-on and giving it the lowest priority (highest priority number).

Hello dears! Nothing worked.
Tried to use all of the above firmware versions, but not one did not solve the problem.
I have MikroTik hEX PoE RB960PGS, trying to connect ipcam DS-2CD2532F-I(W)S. POE standards are the same, power reserve should be enough!! I'm already thinking about the fact that my power adapter can not cope with the current.
This cannot be the case - why did the manufacturer indicate that this router supports 802.3 at mode?!
Could you tell me please, can I do something wrong? Cable checked, camera checked (on other POE router) On MikroTik POE also works!
Link to a screen of the error: https://dropmefiles.com/MGKsR

i have the same problem all ports show short cicuit and i changed allreday the powerbox and the problem contiunes, voltage is above 24volts with the proper conctor , i use FW 6.48.3 also tried the newest beta with no results
any other option what that could be ? (mine is not a PRO )